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← ScienceWhich risk increases for a cryocooler employing helium-4 when internal pressure exceeds lambda point?
A)Reduced efficiency of heat transfer✓
B)Increased vibrational instability of components
C)Greater electrical resistivity locally material
D)Significant rise to internal temperatures
💡 Explanation
Exceeding the lambda point during He-4 phase transitions disrupts superfluidity because the Kapitza resistance increases significantly causing reduced heat transfer rather than changes to vibration, electrical properties or overall temperature increases; therefore, efficiency goes down.
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